Mew

Its DNA is said to contain the genetic codes of all Pokémon, so it can use all kinds of techniques.

Ability — Memories of Dawn: This Pokémon can use the attacks of any of your Basic Pokémon in play. (You still need the necessary Energy to use each attack.)

Encounter: Search your deck for a Pokémon, reveal it, and put it into your hand. Shuffle your deck afterward.